Custom User Attribute Option

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I have different type of users, I have different user attributes relevant to each type, I would like on the, "Add User" page present only the relevant attributes to be filled.
A have created a new dashboard single page /dashboard/users/add_type1
Now I would like to add a Custom User Attribute Option to the system that would signify which type this attribute belongs to and then in the controller for the above mentioned page pull only the attributes that have that option selected.
Does anybody knows how to add Custom User Attribute Option?